So I opened it up, and once the black wire goes inside the keyboard, it spread into the four colored fire. These are soldered onto the circuit board, next to lettersWhite : V (olts)Yellow : D (ata)Green : C (LK)Red: G (round)

I haven't tried it yet, but I hope it works. I'll get back to you all on that.

It's a foot switch (I'm not sure where that come from) connected to the guts of a USB keyboard, wired so that one foot pedal will generate "page up" and the other will generate "page down." It is supposed to be destined to become part of a music system so that a guitarist can advance pages of lyrics/chords on a laptop as she sings/plays, rather than having to deal with the current 50+ pounds of paper...